Low-cost high-fluidity backfill material and preparation method thereof

A high-fluidity, low-cost technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of low resource utilization rate of phosphogypsum, difficult access to compaction equipment, and poor compaction quality of backfill and other issues, to achieve the effect of large promotion and application potential, high mobility, and quality improvement

Active Publication Date: 2020-12-01
SHANGHAI MUNICIPAL ENG DESIGN INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the annual discharge of phosphogypsum in my country has exceeded 50 million tons, and its stockpiles have exceeded hundreds of millions of tons. However, the resource utilization rate of phosphogypsum in my country is low. Pollution to water and air
[0005] At the same time, in the process of urban construction, projects such as pipeline network reconstruction, pipe gallery construction, and abutment construction all involve backfilling construction, and these backfilling parts have the characteristics of narrow space, and it is difficult for conventional compaction equipment to enter, resulting in backfilling pressure. The real quality is poor and will cause diseases such as uneven settlement in the later stage
In addition, as an ideal backfill material, natural sand has become difficult to purchase and the cost is high due to the tightening of environmental protection policies

Method used

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  • Low-cost high-fluidity backfill material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A low-cost high-fluidity backfill material, made of the following raw materials by weight: 100 parts of engineering mud (NJ-1), 5 parts of engineering dregs (ZT-1), 0.5 parts of quicklime, and 10 parts of recycled fine aggregate 1.5 parts of grade II fly ash, 2.5 parts of phosphogypsum, 0.2 parts of sodium sulfate and 3 parts of S95 grade slag powder. The preparation method is as follows: add quicklime to the engineering mud (NJ-1) and stir evenly, drain the supernatant after standing for 6 hours; then add engineering dregs (ZT-1) and continue to stir evenly; finally, add the remaining raw materials and Stir evenly to obtain a mixture with good fluidity, which is the product of the present invention, denoted as C1.

Embodiment 2

[0038] A low-cost and high-fluidity backfill material, made of the following raw materials by weight: 100 parts of engineering mud (NJ-1), 15 parts of engineering dregs (ZT-2), 0.9 parts of quicklime, and 14 parts of recycled fine aggregate 3.0 parts of Class II fly ash, 4.0 parts of phosphogypsum, 0.4 parts of sodium sulfate and 5 parts of S95 grade slag powder. The preparation method is as follows: add quicklime to the engineering mud (NJ-1) and stir evenly, drain the supernatant after standing for 8 hours, then add engineering dregs (ZT-2) and continue to stir evenly, finally, add the remaining raw materials and mix Stir evenly to obtain a mixture with good fluidity, which is the product of the present invention, denoted as C2.

Embodiment 3

[0040] A low-cost and high-fluidity backfill material, made of the following raw materials by weight: 100 parts of engineering mud (NJ-2), 22 parts of engineering dregs (ZT-3), 1.4 parts of quicklime, and 18 parts of recycled fine aggregate 4.0 parts of Class I fly ash, 6.0 parts of phosphogypsum, 0.6 parts of sodium sulfate and 8 parts of S105 grade slag powder. The preparation method is as follows: add quicklime to the engineering mud (NJ-2) and stir evenly, drain the supernatant after standing for 9 hours, then add engineering slag (ZT-3) and continue to stir evenly, finally, add the remaining raw materials and mix Stir evenly to obtain a mixture with good fluidity, which is the product of the present invention, denoted as C3.

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Abstract

The invention provides a low-cost high-fluidity backfill material and a preparation method thereof. The backfill material is prepared from the following raw materials in parts by weight: 100 parts ofengineering slurry, 5-30 parts of engineering muck, 0.5-2.0 parts of quick lime, 10-25 parts of recycled fine aggregate, 1.5-5.0 parts of fly ash, 2.5-8.0 parts of phosphogypsum, 0.2-0.7 part of sodium sulfate and 3-12 parts of slag powder. Construction and industrial wastes such as engineering slurry, engineering muck, recycled fine aggregate, phosphogypsum and the like are used as main raw materials, the backfill material which is economical, applicable and good in workability is provided, according to the method, resource utilization of building and industrial waste is achieved, the problemof shortage of backfill materials is solved, meanwhile, the quality of backfill engineering is improved, a new solution is provided for garbage enclosure and resource shortage in the urban development process, and the method has good social, environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a backfill material with low cost and high fluidity prepared by using engineering mud and engineering dregs and a preparation method thereof. Background technique [0002] While the high-speed urbanization construction has brought continuous growth to my country's economy, it also makes my country face severe development problems such as garbage siege and resource shortage. How to use waste safely, rationally and effectively and reduce dependence on natural resources will be the key to my country's sustainable development goals. Judging from the high waste recycling rate in developed countries and existing research and application reports, most construction and industrial waste have high resource utilization value. [0003] Engineering mud refers to the mud produced by bored pile foundation construction, underground diaphragm wall construction and mud-water ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/22C04B18/16C04B22/14
CPCC04B28/186C04B18/16C04B22/144C04B2201/50C04B22/064C04B18/08C04B22/147Y02W30/91
Inventor 郑晓光水亮亮徐弯弯陈亚杰任奇吴立报
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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